An Effective Technique to Constrain the Non‐Uniqueness of Receiver Function Inversion

Abstract

AbstractThe relation curve between the apparent velocity of S wave and the filter‐parameter is obtained by low‐pass filtering the radial and vertical receiver function, then it is transformed into the S velocity structure beneath the station with empirical formula; moreover, the S velocity structure will be regarded as initial model for receiver function inversion. The numerical simulation indicated that the inversion processes would approach quickly to the true model once the initial S velocity can supply the effective constraint to inversion, even if the depth of Moho is not accurate. In addition, for the same initial S structure, the inversion results also approach to the true model quickly, even adding 10% of random noises to the “observed” receiver function, and 5% of positive and negative perturbation to the velocity ratio (corresponding to the Poisson's ratio of 0.27 and 0.23) respectively. We processed the teleseismic receiver function recorded by Baoshan station. The result from our method is similar to that of sounding section. These confirmed that the inversion processes of receiver function are not sensitive to the initial P velocity if the initial S wave velocity can provide the effective constraint information.